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Message-ID: <d685bee8-c760-463b-ba72-6c6dda2cd96c@bp.renesas.com>
Date: Wed, 14 Feb 2024 09:29:49 +0000
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Subject: Re: [RFC PATCH net-next v2 6/7] net: ravb: Enable SW IRQ Coalescing
 for GbEth
Content-Language: en-GB
To: Sergey Shtylyov <s.shtylyov@omp.ru>,
 "David S . Miller" <davem@davemloft.net>, Eric Dumazet
 <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>,
 Paolo Abeni <pabeni@redhat.com>
Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
 Wolfram Sang <wsa+renesas@sang-engineering.com>, netdev@vger.kernel.org,
 linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20240206091909.3191-1-paul.barker.ct@bp.renesas.com>
 <20240206091909.3191-7-paul.barker.ct@bp.renesas.com>
 <2251fe66-11b7-2f30-c905-7bc1b9a57dab@omp.ru>
 <895bdec7-05d6-4435-8be1-fe8ca716cbcb@bp.renesas.com>
 <7c28bbea-0b3f-ee62-05c8-e6f1bc738b0b@omp.ru>
From: Paul Barker <paul.barker.ct@bp.renesas.com>
Organization: Renesas Electronics Corporation
In-Reply-To: <7c28bbea-0b3f-ee62-05c8-e6f1bc738b0b@omp.ru>
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From: Paul Barker <paul.barker.ct@bp.renesas.com>
To: Sergey Shtylyov <s.shtylyov@omp.ru>,
 "David S . Miller" <davem@davemloft.net>, Eric Dumazet
 <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>,
 Paolo Abeni <pabeni@redhat.com>
Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
 Wolfram Sang <wsa+renesas@sang-engineering.com>, netdev@vger.kernel.org,
 linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org
Message-ID: <d685bee8-c760-463b-ba72-6c6dda2cd96c@bp.renesas.com>
Subject: Re: [RFC PATCH net-next v2 6/7] net: ravb: Enable SW IRQ Coalescing
 for GbEth
References: <20240206091909.3191-1-paul.barker.ct@bp.renesas.com>
 <20240206091909.3191-7-paul.barker.ct@bp.renesas.com>
 <2251fe66-11b7-2f30-c905-7bc1b9a57dab@omp.ru>
 <895bdec7-05d6-4435-8be1-fe8ca716cbcb@bp.renesas.com>
 <7c28bbea-0b3f-ee62-05c8-e6f1bc738b0b@omp.ru>
In-Reply-To: <7c28bbea-0b3f-ee62-05c8-e6f1bc738b0b@omp.ru>

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On 12/02/2024 20:40, Sergey Shtylyov wrote:
> On 2/12/24 2:45 PM, Paul Barker wrote:
> [...]
>>>> diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ether=
net/renesas/ravb.h
>>>> index 55a7a08aabef..ca7a66759e35 100644
>>>> --- a/drivers/net/ethernet/renesas/ravb.h
>>>> +++ b/drivers/net/ethernet/renesas/ravb.h
>>>> @@ -1078,6 +1078,7 @@ struct ravb_hw_info {
>>>>  	unsigned nc_queues:1;		/* AVB-DMAC has RX and TX NC queues */
>>>>  	unsigned magic_pkt:1;		/* E-MAC supports magic packet detection */=

>>>>  	unsigned half_duplex:1;		/* E-MAC supports half duplex mode */
>>>> +	unsigned needs_irq_coalesce:1;	/* Requires SW IRQ Coalescing to ac=
hieve best performance */
>>>
>>>    Is this really a hardware feature?
>>
>> It's more like a requirement to get the best out of this hardware and =
the Linux networking stack.
>>
>> I considered checking the compatible string in the probe function but =
I decided that storing a configuration bit in the HW info struct was clea=
ner.
>=20
>    Yes, but you added the new bit under the "hardware features" commet.=
 :-)
>=20
>>>    Also, s/Requires SW/Needs software/ and s/to achieve best performa=
nce//,
>>> please...
>>
>> Will do.
>=20
>    The comment is too long, I think. :-)

I'll fix both in the next revision.

--=20
Paul Barker

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